I enjoy both, they have different styles and are able to match the crowds energy.
The only reason I rather Joe Martinez for some UFC events(WEC bless) is because his announcements are a lot quicker and still get you pretty hyped.
Don't get me wrong I don't hate the long announcements Bruce usually does, but it really drags on when you have like 15-20 minutes breaks between each bout and by that point you I just want to see the fight itself instead of having another 3-5 minutes spent doing the intros.